I ordered two boards. Both accept code and the GPIO pins work fine. However, you cannot use WiFi. As others have pointed out, to use an external antenna you must replace the 0 ohm resistor. However, none of my boards work with the built-in antenna. If your application doesn't require Wi-Fi, these Wi-Fi cards are great.
Gadgets World FBA_ALFA ARSN19M OMNI Directional High Gain
9 Review
πΆ Proxicast Ultra Low Profile MIMO 3G / 4G / LTE Omni-Directional Screw-Mount Antenna for Verizon, AT&T, Sprint (and Others) Modems & Routers with SMA External Antenna Ports
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4G LTE modem MikroTik LHG LTE6 kit white
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Bingfu Dual Band WiFi Antenna (2-Pack) for Ultimate Wireless Performance
11 Review
UGREEN USB 3.0 Ethernet Adapter Hub with RJ45: Fast Gigabit Ethernet Converter, 3 Ports USB 3.0 Hub Compatible for MacBook, iMac, Surface Pro, Chromebook, Laptop, PC
11 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
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π uni USB C Hub with Ethernet Adapter, 4K HDMI, Gigabit Ethernet, and 3 USB 3.0 Ports for MacBook Pro, iPad Pro, XPS
11 Review